Sealing the Filler Neck

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Owen Snell
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Sealing the Filler Neck

Post by Owen Snell » Mon Jun 26, 2017 1:21 pm

Down to my last oil leak (fingers crossed) traced coming from the filler neck. The neck is new. There's a seal shown on some of the parts diagrams, but not sold anywhere. What is the best way to stop this leak?

wreck
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Re: Sealing the Filler Neck

Post by wreck » Mon Jun 26, 2017 4:46 pm

not enough info , are you talking about the plastic filler neck that clamps onto the filler tube on a kombi/micro bus ?
No matter where you go , there you are !

Owen Snell
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Re: Sealing the Filler Neck

Post by Owen Snell » Tue Jun 27, 2017 12:55 am

Yes, that's the one, plastic with the spring clamp.

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Piledriver
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Re: Sealing the Filler Neck

Post by Piledriver » Tue Jun 27, 2017 2:56 am

I can't say I have ever had that issue, its typically self sealing with the spring pressure, is the tube smooth where clamped? scratches or such? Have a pic of the "seal" or the diagram?

I'd try Permatex#3 liquid or equivalent, it never completely sets, so it has a little give.

RTV is a Bad Idea anywhere on an ACVW with very, very limited exceptions, and carefully, sparingly applied if then.
If you can't ~see through it you probably used way too much, and the excess finds its way to the oil pickup strainer....
It's best avoided completely.
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

Owen Snell
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Re: Sealing the Filler Neck

Post by Owen Snell » Tue Jun 27, 2017 4:04 am

It's a replacement filler neck, the previous was also a replacement part. I can see where it should seal, seems the neck isn't really that good quality and the clip isn't exactly 'round'. I've found some oil barrier tape made by 3M, this in the sealing area and then a decent clamp might do it.

wreck
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Re: Sealing the Filler Neck

Post by wreck » Tue Jun 27, 2017 5:20 am

I use a hose clamp , Jubilee clip in your language :-) . also make sure your breather set up is up to the job , crank case pressure can blow oil out everywhere .
No matter where you go , there you are !

Owen Snell
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Re: Sealing the Filler Neck

Post by Owen Snell » Tue Jun 27, 2017 5:34 am

I've ordered a correct size spring clip, although that's a double wire, and some jubilee clips. The single wire clip supplied with the neck is rubbish - it's oval when closed, so can't seal properly. Got some Rocol oil seal paste to, will use sparingly before tightening.

Owen Snell
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Re: Sealing the Filler Neck

Post by Owen Snell » Tue Jun 27, 2017 5:35 am

Regarding the breather, that is routed through the charcoal cannister. I tried blowing through the pipe and there was a bit of resistance, but not much. Certainly not blocked. Am I better venting the breather pipe some other way?

wreck
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Re: Sealing the Filler Neck

Post by wreck » Tue Jun 27, 2017 6:10 am

I can't really say in a standard arrangement , I've just fitted an exhaust venting breather that is supposed to draw vacuum early days on it so I can't give any feed back.
Most people I know vent the breathers into the air filter about the carbs throat , again every one I know run dual Webber's or dellortos .
No matter where you go , there you are !

Owen Snell
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Re: Sealing the Filler Neck

Post by Owen Snell » Tue Jun 27, 2017 6:13 am

The breather goes through the cannister and into the tops of the air filters. Ive got IDF pattern throtle bodies. I'll get the neck properly clamped and then see if it's pushing out anywhere else.

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Clatter
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Re: Sealing the Filler Neck

Post by Clatter » Sat Jul 01, 2017 8:17 am

Maybe try just routing the breather to an open tube for a while, and see if that fixes?

Having resistance in your charcoal can seems like a good way to cause your issue..
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Beginners' how-to Type 4 build thread ---> viewtopic.php?f=1&t=145853

Owen Snell
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Re: Sealing the Filler Neck

Post by Owen Snell » Wed Sep 13, 2017 7:17 am

The spring clamp was not very effective, so I replaced it with 2 x jubilee clips and some oil resistant jointing compound on assembly. That fixed it.

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